9*pi or 28.27 cm (to 2 dp)
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It is 28.3 cm, approx.
Doubling the radius doubles the circumference.
56.549 cm
Construct a circle with a 4.5 radius. The circle's circumference is 360 degrees. So mark out 3 by 120 degrees on the circumference and join them to the centre of the circle which will divide the circle into three equal parts.
Diameter of a circle = circumference/pi